Hypodermic needle



July 2s, 1925. 1,547,551

W. BRODY EYPoDEEMrc NEEDLE Filed may 15. 1524 *9 r1l if L10 7 PatentedJuly 28, 1925.

WILLIAM BRODY, 0F NEW YORK, N. Y.

HYPODERMIC NEEDLE.

implication inea May 15,

To all wlw/my it may concern.'

Be it known that I, iVILLL-iisr BRoDY, a citizen of the United States ofAmerica, residing at New York, in the county of New York and State ofNew York, have invented Certain new and useful Improvements inHypodermic Needles, of which the followingl is a specification.

My invention relates to improvements in hypodermic needles of the typeused for local anesthesia. y

Heretofore it has been customary to provide hypodermic needles withwashers, located between the syringe and the nozzle to insure a leakproof joint. However this practice has many disadvantages and animportant object of this invention is to provide a hypodermic needle inwhich these washers will be eliminated, and yet a leak-proof joint willbe effected between the syringe and the nozzle.

Other objects and advantages of the invention will be apparent duringthe course of the" following description.

In the accompanying drawings which form a part of this specification andin which like numerals are employed to designate like parts throughoutthe same.

Figure l is a central longitudinal section through a needle involving myinvention, and,

Figure 2 is a transverse section on the .line 2 2 of Figure l.

In the drawings, wherein for the purpose of illustration is shown apreferred embodiment of my invention, the numeral 5 designates the usualsyringe having the screwthreaded nipple 6 provided with thelongitudinally extending port or opening 7. rIhe needle 8 is preferablytapered in form and is swaged solidly in the nozzle 9 to form anintegral part thereof. This nozzle is provided with a screw-threadedopening 10 in the end opposite to the needle receiving end which isadapted to receive the nipple 6. A central longitudinal opening' ll isarranged in said nozzle and is adapted to reg'- ister with the opening 7of the nipple when the parts are assembled.

rIhe opening 10, instead of ending in a flat surface is provided with araised portion or elevation l2 which ends in a. fiat surface surroundingthe opening 11, and of a lesser diameter than the nipple 6, the sides ofthe elevation being tapered towards the lower end of the recess lO. Itwill there- 1924. serial No. 713,474.'

fore be seen that the end of the nipple will contact with the surface ofthe elevation and will be spaced from the bottom ofthe recess.v l

l/Vhen the nozzle is screwed onto the nipple the surface of theelevation will engage the end of the nipple and as the nozzle istightened, the joint will be-rendered leakproof, due to the reducedsurface of the elevation, which is due to the slanting walls thereof.This reduced surface surrounds the central openings l0 and ll and willprovide a leakproof joint therebetween. n

It is obvious that the needle does not depend upon the syringe to holdit in the nozzle but is formed as an integral part of the nozzle. j

It can readily be seen that my improved structure renders a washerunnecessary, and provides a much better joint than if a washer wereused, and of course there is no danger of forgetting the Washer ornecessity of replacing it.

While I have shown and described the preferred embodiment of myinvention, it is to be understood that various changes in the shape,size, and arrangement of parts may be resorted to without departing fromthe spirit of my invention vor the sco-pe of the subioined claims.

Having described my invention what I claim and desire to protect byLetters Patent is:

l. In a. hypodermic needle, a nozzle having an opening` therein adaptedto receive the end of a syringe, said opening having an elevation in itsend adapted to contact with the surface of the end of the syringe toform a leakproof joint of less. surface Contact than the surface of theend of the syringe.

2. In a. devicevof the character described, a nozzle having an opening'therein adapted to receive the end of a syringe, said opening ending inan elevation which has a surface of a diameter less than the diameter ofthe opening, said elevation being adapted to contact with the end of thesyringe, said contact being of substantially less area than the area ofthe end of .the syringe.

3. In a device of the character described, a nozzle having an openingtherein adapted to receive the end of a syringe, said nozzle also havinga central longitudinal passage therethrough, said first named openinghavfr 1o ing its end provided with a raised -portion having a flatsurface of less `diameter 'than the diameter of the opening, said raised-portion being arranged about, and adjacent the longitudinal passage andadapted to contact With the end of the syringe,"tl1ereby forming a smallsurface of contact to insure a leakproof joint. Y

4. In a device of the character described, fthe combination with asyringe having a screwsthireaded nipple and `a central passageltherethrough, of a nozzle having a screwthreaded recess to receive thenipple, and -being also 4'provided with a Icentral `longitufdinal-passage laclapted .-'to register with `'the passageLinthe nip-ple, saidLrecess having its end formed with a raised portion having a lietsurface surroundingsaid passage Way land o' fa "less `'diameter r4thanthe `diameter if the nipple, said fialtfsurface of the raised portion@bei-ng adapted to engage thelend of the nipple'to for-nula leahproofjoint of less surface contact than the endfof the nipple.

`5. In 1a idevice of the -1 character described, the combination with asyringe having a screwvthreaded ni-pple and a central longitudinalpassage therethrough, of a nozzle having ia needle formed therewith,said nozzle having a screwthreaded recess to re- Aeeive said`fri-ilpple, and a longitudinal passage adapted to registered With thepassage in the nipple, -said recess Vhaving its Vend itaperedoutwardlyto 'form a Iraised-surface off reduced diameter concentrically larrangedabout said longitudinal passage, said raised surface being adapted toengage the end of the nipple about Ethe passage therein, and

'be pressed against saidnipple yto Iform a lealrproof joint therewithyof a surface `'substantially less than the sur-face `of the --end ofthe nipple.

In testimony whereof I aHX lmy `signa- "tu-re. i

"XVIELIAM BRDY.

